David Greenglass

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available from Wikipedia or other free sources online. David Greenglass
was recruited into Soviet espionage by his wife, Ruth Greenglass, at the
behest of his sister Ethel Rosenberg, and brother-in-law, Julius
Rosenberg. The Rosenbergs were executed in 1953 after being convicted of
conspiracy to commit espionage with regard to American atomic secrets.
Greenglass reportedly shared an interest in Communism with the
Rosenbergs.